This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The state or quality of being sumptuous.

n. The result or product of being sumptuous.

n. The state of being sumptuous; costliness; expensiveness; splendor; magnificence.

n. wealth as evidenced by sumptuous living

n. the quality possessed by something that is excessively expensive

"Even then, the term sumptuousness may seem ill-chosen, since the nomadic nature of African life persists in spite of palaces and chamberlains and all the elaborate ritual of the Makhzen, and the most pompous rites are likely to end in a dusty gallop of wild tribesmen, and the most princely processions to tail off in a string of half-naked urchins riding bareback on donkeys."

wealth    wealthiness    expensiveness   

luxury   

lavishness    sybaritism    massiveness    free-and-easiness    loftiness